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MCP73871-1AAI/ML
Microchip Technology
IC BATT CHG LI-ION 1CELL 20QFN
9797 Pcs New Original In Stock
Charger IC Lithium Ion/Polymer 20-QFN (4x4)
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*Quantity
Minimum 1
Minimum 1
5.0 / 5.0
- (372 Ratings)
MCP73871-1AAI/ML
Product Overview
1310063
DiGi Electronics Part Number
MCP73871-1AAI/ML-DGManufacturer
Microchip Technology
MCP73871-1AAI/ML
Description
IC BATT CHG LI-ION 1CELL 20QFNInventory
9797 Pcs New Original In Stock
Charger IC Lithium Ion/Polymer 20-QFN (4x4)
CAD Models - PCB Symbols & Footprints
Quantity
Minimum 1
Minimum 1
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Warranty & Returns
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MCP73871-1AAI/ML Technical Specifications
Category
Power Management (PMIC), Battery Chargers
Packaging
Tube
Series
-
Product Status
Active
Battery Chemistry
Lithium Ion/Polymer
Number of Cells
1
Current - Charging
Constant - Programmable
Programmable Features
Timer
Fault Protection
Over Temperature
Charge Current - Max
1.1A
Battery Pack Voltage
4.1V
Voltage - Supply (Max)
6V
Interface
USB
Operating Temperature
-40°C ~ 85°C (TA)
Mounting Type
Surface Mount
Package / Case
20-VFQFN Exposed Pad
Supplier Device Package
20-QFN (4x4)
Base Product Number
MCP73871
Datasheet & Documents
HTML Datasheet
MCP73871-1AAI/ML-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Standard Package
91
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
L’emballage sécurisé et la traçabilité fiable font de DiGi Electronics un leader dans le secteur.
de desembre 02, 2025
Die Webseite von DiGi Electronics ist äußerst zugänglich und erleichtert das Finden der benötigten Produkte. Die Preise sind sehr konkurrenzfähig.
de desembre 02, 2025
DiGi Electronics consistently delivers products on time, demonstrating excellent logistics management.
de desembre 02, 2025
Fast delivery and safe packaging made my shopping experience very pleasant.
de desembre 02, 2025
DiGi Electronics' support team is always courteous and efficient, which I greatly appreciate.
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Frequently Asked Questions (FAQ)
How does the MCP73871-1AAI/ML handle thermal management risks during high-current charging in compact designs?
The MCP73871-1AAI/ML integrates over-temperature protection to disable charging when die temperature exceeds safe limits, but thermal performance heavily depends on PCB layout. In compact or enclosed designs, inadequate copper pour on the exposed pad can lead to premature thermal shutdown. To mitigate this, allocate at least 150mm² of solid ground-connected copper under the device and use multiple vias to inner thermal planes. This reduces thermal resistance and supports sustained 1A+ charging without triggering fault states, especially in ambient temperatures above 60°C.
Can the MCP73871-1AAI/ML safely replace the BQ24075 in a USB-powered portable device, and what are the key design-in trade-offs?
Yes, the MCP73871-1AAI/ML can replace the BQ24075 in USB-powered single-cell Li-ion applications, but key differences affect reliability. Unlike the BQ24075, the MCP73871-1AAI/ML lacks automatic input voltage regulation (VINDPM), increasing risk of USB host overload under high load and charge conditions. To ensure compatibility, implement external current limiting on the input or monitor total system draw to stay within USB 500mA or 1.5A spec limits. Additionally, the MCP73871-1AAI/ML requires an external timer capacitor instead of internal timer control, adding one component but allowing precise charge duration tuning.
What are the risks of using the MCP73871-1AAI/ML with a 4.1V battery pack instead of standard 4.2V cells, and how should charging parameters be adjusted?
Using the MCP73871-1AAI/ML with a 4.1V Li-ion battery pack requires careful adjustment because the device’s default regulation voltage is typically 4.2V. Charging a 4.1V cell to 4.2V risks overvoltage and reduced battery lifespan. To mitigate this, verify that the specific variant (-1 suffix) regulates at 4.1V; the MCP73871-1AAI/ML is designated for 4.1V regulation. Always confirm the charge termination voltage with a multimeter during validation, and ensure the battery protection circuit (if present) is rated for the lower voltage threshold to prevent false trips.
How does the MCP73871-1AAI/ML behave during USB voltage drops or brownout conditions, and what design measures prevent erratic charging behavior?
The MCP73871-1AAI/ML lacks explicit UVLO hysteresis control, so it may restart charging erratically during USB brownouts, causing current surges that disrupt host devices. To ensure stable operation, place a low-ESR 10µF ceramic capacitor directly at the input pin and consider adding a voltage supervisor IC or use a USB power switch with brownout hold-off, such as the TPS2051. This stabilizes the input supply and prevents repeated charge cycles that can degrade battery health and increase EMI.
What are the long-term reliability concerns with the MCP73871-1AAI/ML in outdoor or high-humidity environments, and how does MSL 3 rating impact assembly?
The MCP73871-1AAI/ML carries an MSL 3 (168-hour floor life) rating, meaning it must be baked and reflowed within a controlled timeframe if exposed to humidity beyond 30°C/60% RH. In outdoor applications, moisture ingress during operation can lead to electrochemical migration, especially on the exposed pad. To ensure reliability, conformal coat the assembled PCB and store unused reels in dry cabinets. Also, validate complete reflow thermal profiles to ensure the exposed pad is fully soldered—voids here increase thermal resistance and accelerate long-term degradation.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
MCP73871-1AAI/ML CAD Models
Microchip Technology MCP73871-1AAI/ML PCB symbols & footprints
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